Name: Extension Builder
Brand: HaMuch
SKU: extension-renovation
Rating: 4.63 (20 reviews)

Find affordable Selly Oak extension builders

Prices range from cheapest £24/hour and £196/day (ARGENT BUILDERS LTD) to £45/hour and £350/day (Sperin Interiors) - average £31/hr and £239/day

HaMuch is Excellent

Local Selly Oak extension builders & latest jobs

"Build a kitchen extension" - B13, job posted 28/08/26

"Loft conversion" - B47, job posted 19/08/26

"Build an economic shed Slabbed area = 1.8*3.6m. Please quote me materials +labour. Wants a wooden structure" - B45, job posted 10/07/26

"Loft conversion" - B30, job posted 26/05/26

"Loft conversion" - B68, job posted 06/05/26

"RSJ installation" - BIRMINGHAM, job posted 13/04/26

"Dormer loft conversion" - B62, job posted 17/03/26

"Garden self contained annex" - B68, job posted 10/11/25

"Small downstairs extension to front property, to install a toilet and associated plumbing, remove small brick wall on drive" - B32, job posted 18/10/25

"Two storey extension" - WEST MIDLANDS, job posted 05/10/25

"Concrete foundation" - B29, job posted 03/09/25

"Two storey extension" - WEST MIDLANDS, job posted 03/08/25

"Two storey extension" - B68, job posted 21/07/25

"Two storey extension" - WEST MIDLANDS, job posted 08/06/25

"Loft conversion" - B28, job posted 26/05/25

"We would like a builder for a 3m extension to the back of our house (similar to a conservatory)." - B30, job posted 15/03/25

"TV aerial install" - B11, job posted 05/03/25

"Side return extension" - BIRMINGHAM, job posted 24/02/25

"Build an outbuilding" - B14, job posted 05/02/25

"Loft conversion" - BIRMINGHAM, job posted 07/01/25

What are the best ways to avoid problems when paying the Extension Builder?

The most important thing is do avoid handing over cash or paying large sums in advance. Be wary of paying cash for a cheaper job, i.e. to avoid VAT, you may be going down a slippery slope of not doing things properly which may eventually mean your job is also not done properly.

Agree when you intend to pay, ideally after you are satisfied with the completed job. If it is a big job agree a schedule of staged payments which is fair to both parties.

To avoid bad tradespeople and to ensure you can find them should they not answer a mobile;

Get proper contact details and check them yourself
Check if the company is verified on the Companies House website
Get phone details, ideally a land line or 0800 number and check it
Get a physical office address

Before the job starts should I agree standards of quality and behaviour?

Get quotes in writing by email or in person if possible. Getting quotes online or by text is ok (make sure you accept the offer by replying). For large projects make a written agreement, schedule of works and snagging plans as part of a working document. Also;

Agree expected quality of workmanship and materials in advance
When will work start and when will project be finished, what happens if project over runs ?
How long is the guarantee on work and materials eg 12 months
Discuss onsite behaviour in advance (no smoking, swearing or using mobile phones for non-work purposes)
Agree that your Extension Builder will remove all debris and rubbish and what level of tidying up you want after job

Compare Selly Oak extension builders rates

Compare Selly Oak extension builders rates (excluding VAT or callout charges)
Location in UK	Hourly Rate	Daily Rate
Extension Builders near Oldbury	£29	£227
Extension Builders near Halesowen	£29	£227
Extension Builders near Smethwick	£29	£226
Extension Builders near Birmingham	£29	£227
Extension Builders near Rowley Regis	£29	£226
Extension Builders near West Bromwich	£29	£227
Extension Builders near Sandwell	£29	£229
Extension Builders near Solihull	£29	£231
Extension Builders near Dudley	£28	£225
Extension Builders near Brierley Hill	£28	£222

Job estimates from extension builders near you

Whether you’re looking to extend your kitchen with a side return extension or you want to convert your basement into a liveable space, read our cost guides to get an idea of how much each project costs before getting a more accurate quote from our database of reliable tradespeople.

Build a timber frame extension - £25,848

Garden office - £9,848

Granny annexe - £86,848

Build a flat roof extension - £21,848

Convert a Garage - £15,848

Hip to gable loft conversion - £41,848

Convert a bungalow loft - £28,848

Build a dormer loft conversion - £41,848

Build a swimming pool - £80,848

Build a Mansard loft conversion - £51,848

Concrete foundations - £6,098

Underpin a building - £17,348

Two storey extension - £87,772

Convert a basement - £35,790

Side return extension - £39,790

Loft conversion - £32,325

Garage - £18,348

Single storey extension - £51,960

Outbuilding - £9,848

Install an RSJ - £2,048

Build a kitchen extension - £41,848

More extensions & conversions cost guides...

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